rewrite to rely on server_version_num

Author: swiffer

CHANGELOG.md

@@ -16,6 +16,7 @@
 - feat: use Grafana 12.0.2 (#4805 - @swiffer)
 - feat(mqtt): always publish healthy status and disable retain to prevent stale healthy status via mqtt (#4817 - @allivshits)
 - feat: use the k8s-style API introduced in Grafana v12 if using manual dashboard setup (#4764- @IngmarStein)
+- feat(db-check): allow beta / rc PostgreSQL versions for testing (#4795 - @swiffer)
 
 #### Build, CI, internal
 

lib/teslamate/database_check.ex

@@ -2,70 +2,71 @@ defmodule TeslaMate.DatabaseCheck do
   alias Ecto.Adapters.SQL
   alias TeslaMate.Repo
 
-  # Minimum versions for supported major releases
-  @min_version_16 "16.7"
-  @min_version_17 "17.3"
+  defmodule Version do
+    defstruct [:version_string, :version_num, :major]
+  end
+
+  @version_requirements %{
+    1600 => %{min_version: "16.7", min_version_num: 160_007},
+    1700 => %{min_version: "17.3", min_version_num: 170_003}
+  }
 
   def check_postgres_version do
-    # Start the Repo manually without running migrations
     {:ok, _pid} = Repo.start_link()
 
-    # Query the PostgreSQL version
+    version = get_postgres_version()
+    check_compatibility(version)
+
+    Repo.stop()
+  end
+
+  defp get_postgres_version do
     {:ok, result} =
       SQL.query(
         Repo,
-        "SELECT regexp_replace(version(), 'PostgreSQL ([^ ]+) .*', '\\1') AS version",
+        """
+        SELECT regexp_replace(version(), 'PostgreSQL ([^ ]+) .*', '\\1') AS version,
+               current_setting('server_version_num')::integer AS version_num
+        """,
         []
       )
 
-    raw_version = result.rows |> List.first() |> List.first()
-
-    # Normalize to SemVer by appending .0 if needed
-    version = normalize_version(raw_version)
-
-    # Split into major and minor parts
-    [major, _minor] = String.split(version, ".", parts: 2)
-    major_int = String.to_integer(major)
+    [version_string, version_num] = List.first(result.rows)
 
-    # Check based on major version
-    case major_int do
-      16 ->
-        case Version.compare(version, normalize_version(@min_version_16)) do
-          :lt ->
-            raise "PostgreSQL version #{raw_version} is not supported. Minimum required for 16.x is #{@min_version_16}."
+    # https://www.postgresql.org/docs/current/libpq-status.html#LIBPQ-PQSERVERVERSION
+    major = div(version_num, 100)
 
-          _ ->
-            IO.puts("PostgreSQL version #{raw_version} is compatible (16.x series).")
-        end
-
-      17 ->
-        case Version.compare(version, normalize_version(@min_version_17)) do
-          :lt ->
-            raise "PostgreSQL version #{raw_version} is not supported. Minimum required for 17.x is #{@min_version_17}."
-
-          _ ->
-            IO.puts("PostgreSQL version #{raw_version} is compatible (17.x series).")
-        end
+    %Version{
+      version_string: version_string,
+      version_num: version_num,
+      major: major
+    }
+  end
 
-      major_int when major_int > 17 ->
+  defp check_compatibility(%Version{
+         major: major,
+         version_string: version,
+         version_num: version_num
+       }) do
+    cond do
+      major > 1700 ->
         IO.puts(
-          "PostgreSQL version #{raw_version} is not officially tested or supported yet. Use at your own risk."
+          "PostgreSQL version #{version} is not officially tested or supported yet. Use at your own risk."
         )
 
-      _ ->
-        raise "PostgreSQL version #{raw_version} is not supported. Only 16.x (min #{@min_version_16}) and 17.x (min #{@min_version_17}) are supported."
-    end
+      not Map.has_key?(@version_requirements, major) ->
+        supported_versions =
+          @version_requirements
+          |> Map.values()
+          |> Enum.map_join(" and ", & &1.min_version)
 
-    # Stop the Repo after the check
-    Repo.stop()
-  end
+        raise "PostgreSQL version #{version} is not supported. Only #{supported_versions} are supported."
+
+      version_num < @version_requirements[major].min_version_num ->
+        raise "PostgreSQL version #{version} is not supported. Minimum required for #{div(major, 100)}.x is #{@version_requirements[major].min_version}."
 
-  # Helper function to normalize PostgreSQL version to SemVer
-  defp normalize_version(version) do
-    case String.split(version, ".") do
-      [major, minor] -> "#{major}.#{minor}.0"
-      [major, minor, patch | _] -> "#{major}.#{minor}.#{patch}"
-      _ -> raise "Invalid PostgreSQL version format: #{version}"
+      true ->
+        IO.puts("PostgreSQL version #{version} is compatible (#{div(major, 100)}.x series).")
     end
   end
 end